Biochar-induced priming effects were different between different soils, however the relationship between the priming effect and soil properties were still unclear. ¹³C-labelled biochar pyrolyzed from ¹³C-labelled wheat straw was incorporated into 4 kinds of soils with contrasting properties for one-year incubation in lab, additionally, equivalent carbon amount ¹³C labelled wheat straw was also conducted. Results showed that biochar induced significant negative priming effects in Mollisol paddy soil and Inceptisol paddy soil, and the priming amount were -284 mg/kg and -157 mg/kg, respectively, but in Ultisol paddy soil and low fertility Untisol paddy soil (long-term experiment plot without fertility amendment), biochar induced positive priming effects with 33.3 mg/kg and 58.0 mg/kg priming amount respectively; Wheat straw induced different positive priming effects in soils, and the positive priming amounts were higher than those of the biochar-induced. Biochar-induced priming effect was significantly negatively correlated with soil EC (r=-0.884) and soil pH (r=-0.824). After one-year incubation, and the cumulative biochar-carbon decomposition were 15.6 mg/kg in Mollisol paddy soil, 14.2 mg/kg in Untisol paddy soil, 10.4 mg/kg in Inceptisol paddy soil and 9.92 mg/kg in low fertility Untisol paddy soil; Straw-carbon cumulative decomposition was much higher than biochar-carbon, and it was the lowest in low fertility paddy soil than in other three soils. The calculated carbon net loss was the lowest in Mollisol paddy soil following by Inceptisol paddy soil, and low fertility Ultisol paddy soil was the highest. The study indicates that carbon sequestration effect of biochar is influenced not only by decomposition of biochar-carbon itself, but also by biochar-induced priming effect.